Telephone system



Jan. 29, 1935.

J. BOYSEN TELEPHONE SYSTEM Filed Dec. 9, 1952 I 16 VA I l -l- [Nut/v70? Arrr- Patented Jan. 29, 1935 UNITED STATES naamonasrsmm J Doreen, Berlin Germany a.

Siemens. &

10. Claims. ((31. 179-16).

Ifhe' present invention relates to a circuit arrangement for carrying out switching operations by means of" relays caused to operate overneon lamps" and used more particul'arlyin telephone systems. This type of arrangement, however, is defective in that in addition to the existing exchange battery other current supplies have to be provided, such as, for example, a'ltemating current generators, transformers, additionalbattery, etc., due to the fact that as a rule the striking voltage is considerably higher than the battery voltages generally used in such systems.

According to the present invention, however, such additional current supplies are unnecessary due to the feature that the additional potential required to raise the normal battery voltage to the striking voltage for a neon lamp can be generated by charging a condenser by means of the ordinary exchange battery potential which is lower than the striking voltage.

The accompanying drawing illustrates an embodiment of the invention applicable to the telephone art. The diagram represents an automatic telephone system employing two-wire junction lines. The invention is used with advantage in such systems for the release of connecting devices disposed at the incoming end of a two-wire junction line. Only the switching operations of any importance for the nature of the invention will be described below.

When the junction line VL is seized at its incoming end, for example, by a preceding first group selector, relay C is connected to battery over the c-lead and therefore energized. This relay transmits the seizing operation in any known manner to the second group selector located at the incoming end. The associated switching operations have not been shown. Contacts 2c and 4c are closed on the energization of relay C. One side of the condenser K is then connected to the positive pole of the exchange battery and the other side to the negative pole and the condenser K in question is charged up to the voltage of this battery which in the present example has a value of volts. The closing of contact 10 completes a circuit for relay F which closes its contact f but this has no effect due to contact 30 having been opened previously.

The further switching operations associated with a completion of the connection such as the transmission of impulse series, etc., are now carried out. These operations, however, have no bearing on the present invention and therefore are not described.

At the end of the call the release takes effect from the outgoing enact the junction line whereuponthe c-Iead"itom the preceding first group selector is cut on. B/elay 6 then restores, opens its-contact l'e and'thereblybreaks'the circuit for relay 1'! The 'release of relay"F is greatly re- 5 tarded, with the result-that contact ,f' remains closed acertaih periodatter the-release of relay C. The opening of contacts -2 c. and 4c and the closing of Scand 50' throws the lead for the condenserK'mcwcharged'with 60 volts) which was 10 previously connected to the positive pole of the battery overto the negative pole at the battery with theresult that tl'ie other' condenser lead carries a potential double that of the exchange battery, i. e., volts. This potential which, due to the slow release on the part of relay F is applied for a certain period to the b-lead of the junction line VL is sufliciently high to cause the neon lamp GL in the second group selector at the incoming end of the junction line VL to be lighted. The operation is carried out over the following circuit: earth, battery, contact 50, condenser K, contacts 3c, 1, b-lead oi the junction line V'L, neon lamp G1, winding of relay R, to earth. The condenser is discharged on the lighting of the neon lamp and in this discharge circuit relay R associated with the second group selector operates and opens its contact 1' which cuts off the test circuit to the succeeding switch and initiates its release. The test relay P in the second group selector relapses and initiates the release of this switch in known manner.

At the outgoing end of the junction line the condenser K is disconnected from the b-lead of the junction line VL on the opening of contact I so that the system is now restored to normal.

What is claimed is:

1. The combination with a neon tube, of a battery whose potential is below the striking voltage of the tube, a condenser charged to the potential of said battery, and means for connecting said condenser and said battery in series so that the discharge from the condenser aids the battery to transmit an impulse of current at a potential above the striking voltage of the tube to said tube. 45

2. The combination comprising a neon tube, a battery whose potential is below the striking voltage of said tube, a condenser, means for connecting the two plates of the condenser to the two terminals of the battery, and means for reversing 50 the connection of one plate of the condenser with respect to the battery terminals and for connecting the other plate of the condenser to the tube to operate the same.

3. In combination, a conductor, a neon tube 55 connected to said conductor and ground, a condenser, a source of current of a potential below the striking voltage of the tube, means for connecting the plates of said condenser to said current source and ground, respectively, and means for switching one condenser plate from ground to said current source, and for switching the other condenser plate from-said current source to said conductor to operate the tube,

4. In combination, a neon tube, a battery whose potential is below the striking voltage of said tube, a condenser, a relay, contacts closed bysaid relay for connecting saidcondenser across said battery, and other contacts, ;closedjbysaidfrelay for connecting said battryjsaidcoiide j's'er', and said tube in series to operate the tubej 5. Incombination, a neon tube, abattery whose potential is below the striking voltage' of saidtube, a condenser, two relays, contacts closed by the first relay for connecting said "condenser across said battery, and other, contacts closed by said relay for connecting said battery, said condensers, said tube and said-second relay in series to strike the tube and operate the second relay.

6. In a telephone system, a trunk, a neon tube connected toa conductorjoi the trunk, a battery whose potential isbelow the striking: voltage of the tube, a condenser, means for seizing the trunk, meansresponsive to the seizure of the-trunk for connecting said condenser to said, battery to charge the condenser, and means responsive to the release of the trunkifor connecting said condenser to one trunk conductor to operate said .tube. 1 1 I talking conductors, a test conductor at each end of the trunk, a relay connected to the test con- 'ductorjat the ou'tgoing end of the trunk, a neon tube and a relay connected to a talking conduc- "tor at'the incoming end of the trunk, a battery -whose potential isbelow the striking voltage of said tube, a condenser, contacts controlled by said firstrelay for connecting said conductors to said battery to'charge the condenser, other contacts controlled by said first relay for connecting said condenser and said battery to said one talking conductor to operate the tuber and said second relay, and contacts controlled by said second relay for opening the test conductor at the incoming end of the trunk.

10. A telephone system, as claimed in claim 9, in which a slow releasing relay controlled by the first relay controls contacts for disconnecting the condenser and battery from the talking conductors ofthe trunk.

JNES BOYSEN. 

